Intel HD Graphics are by far the worst - anything by AMD or nVidia is better - but on the other hand Intel graphics chips are very common, so I guess it'll give you a realistic impression of performance!

I think that'd be a great test. I have a low-spec laptop and a netbook to test on and it's really helpful to gauge performance. C2-developed games run through Chrome actually run OK on a netbook, which was shocking too me.